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<1234567…34>
  • 128k Toastrack repair advice needed..Hey all, Just got my second toast rack in a oddball deal when i visited a local farmer for some other second hand stuff. The 128 was sitting in a p…

    ... a replacement [url=http://www.datasheetcatalog.org/datasheet/zetexsemiconductors/ztx650.pdf]ZTX 650 ...
    Asure Asure March 2012 Hardware
  • Audio level on a grey +2Hi all, I received yesterday my "new" Spectrum 128+2 grey. It's a french one (without modulator, and with specific roms : message in french). First …

    ... on which component is tired (ZTX 650 ?)

    Thanks guys ...
    bugpat bugpat February 2007 Hardware
  • another non working issue 3 48kHi all, next! :) I don't have good filings about this speccy :) https://youtu.be/D9qpCR18-kI here is short video what this speccy do. we hav…

    ... memory chips, i change ztx 650 and ztx 213 nothing change,
    what ...
    gorski gorski July 2015 Hardware
  • Issue 6a - no soundHi all I get from ebay one issue 6a, Burned 7805, ztx 650 After this all look fine, zx diagnostic board pass mem test but not have sound, i change…

    ... issue 6a,
    Burned 7805, ztx 650
    After this all look ... not have sound, i change ztx 450 and sound membrane with ...
    gorski gorski December 2015 Hardware
  • No VCC on the TEA2000 on a +2 greyI'm trying to fix a +2 grey that has no RF and composite out, RGB is good and the machine works just fine. I thought it would be an easy job... repl…

    ... tea2000 is absent... replaced the ztx 650 and 213 but no luck ... is zero and on the ztx just around 11V on one ...
    gtsamour gtsamour December 2016 Hardware
  • New member, dead SpeccyHallo everyone, I was directed here from a Commodore (boo, hiss) forum after pleas of aid with my newly acquired, quite dead 128k Speccy. I sincerely…

    ... />
    I replaced the single ZTX 650 transistor that is responsible for ... a charm again. Since the ZTX 650 seems to blow on many ...
    J?rg Pleumann J?rg Pleumann December 2004 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    Did you klnow (or indeed care) - you can use the ZTX651 in place of the ZTX 650. Same spec, slightly higher voltage rating is all.

    Coils - easy to re-wind yourself if you know how.
    Lloyd Lloyd August 2005 Sinclair Miscellaneous
  • 48K power supply coilHi guys, been thinking about making a small quantity of PSU coils for the original 16/48K machines. My problem is, although I can (and have, with gr…

    ... right. I've plenty of ZTX 650's to fry if need ...
    DEATH DEATH June 2006 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... 128k? I could even move ZTX 650 from my working speccy 48k ...
    netomc netomc September 2006 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... board doesn't have any ZTX transistors on it.
    I ... .
    I cannot find any ZTX transistors here (Greece) thets why ... to ship you some free ZTX 650's via air mail if ...
    DEATH DEATH May 2007 Hardware
  • 48K specs boots, but THEN blinking blocks!Of all ZX problems I have seen, the 'blinking blocks' is the most common... Today I picked up a 48K, it boots and THEN it locks filling the screen wi…

    ... it that TR4 is hosed (ZTX 650) its the most common part ...
    ZX-MAD ZX-MAD May 2008 Hardware
  • Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …

    ... /> Those two transistors are ZTX 650 and ZTX 213 from memory (and, more ...
    Spirantho Spirantho July 2010 Hardware
  • Ztx313 (mps2369)Could someone explain what these transistors are a replacement for please?

    ... I have a bag of ZTX 650s I bought on ebay ... with about 13x long-legged ZTX 650s, about 100x short-legged ... a good substitute for the ZTX 650?... who knows.....

    PM ... a couple of short-legged ZTX 650s - ?0.70 each including ...
    toadstool toadstool January 2011 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... created.

    Replace TR4 (ZTX 650) and check the voltages again ...
    JeffB JeffB April 2013 Hardware
  • No sound from speaker.Help! My trusty 48k has stopped giving me sound out of the speaker. It does however give me sound from the EAR socket. I've tried swapping the spea…

    Assuming issue 3 or above:

    test the transistor TR7 - ZTX 450

    It's ok to replace with a ZTX 650 ;) If that fails, the speaker is probably toast.
    DEATH DEATH August 2013 Hardware
  • I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…

    ... lower ram, change my lovely ztx 650 and nothing change at all ...
    gorski gorski November 2013 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... />
    I have a ZTX 213 replacement and a 204/9013I, which ...
    Renegade Renegade August 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... can be replaced with a ZTX 650 if you can't get ...
    DEATH DEATH September 2014 Hardware
  • 48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…

    ... the broken coil. Use a ZTX 650/1/2 for tr4.
    ZTX 750 - you don't need ...
    DEATH DEATH September 2014 Hardware
  • Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…

    ... device, comparable to the '650 in specs, but the PNP ... version (pretty much) of the ZTX 650 - it has a 1A ... rating whilst the '650 has 2A

    ... may be replaced with a ZTX 650/1/2/3
    ... .

    ZTX 653 will replace a '650. Again, same bit ...
    DEATH DEATH October 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... of the E-Line transistors (ZTX range) but I'm not ... alternate pads for either a ZTX 650 or the TIPP thingy that ... s what you do..... The ZTX (TR4) transistor fits into the ... pin-out config as the ZTX range (E-Line). If ... you fit a ZTX 750 here, then it ...
    DEATH DEATH November 2014 Hardware
  • not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …

    ... repair this, switch on and ztx 650 burned immediately :)
    I remove ...
    gorski gorski July 2015 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... have a SMALL stock of ZTX 650 and 750's and as ...
    DEATH DEATH October 2015 Hardware
  • Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…

    ... cause damage.

    The ZTX range of transistors are designed ... ZTX650 equivalent is wrong - the 650 is a 2A transistor, not ... 's too (good replacement for the 312). The 650 can also replace ...
    DEATH DEATH November 2006 Hardware
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    ... ]Yes, I know, there are replacement transistors, but last time I ... .. So I prefer to use ZTX.
    As for ULA, I ... .

    When you use "replacement transistors" you should be aware ... .
    I use ZTX 651 (later version of 650) myself because i ...
    gtsamour gtsamour May 2011 Hardware
  • Help changing TR4 and TR5Hi all! Please, help me! :) I think I'm not understanding the correct pins of TR4/TR5 and the transistors. So, if anyone know the correct pins, help …

    ... the PCB, and there TR4 (650) is depicted with the rounded ... viewing, explained above: for both ZTX transistors the pinning comes down ... , I see a scribble of replacement by BC877. The pins are ...
    roko roko April 2012 Hardware
  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…

    Any tape replacement possible for a +2? My + ...
    Flavio Ferri Benedetti Flavio Ferri Benedetti November 2001 Sales
  • Replacement power suppliesIs it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you c…

    Is it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you could get one that would handle it? It wouldn't need to be an original.
    Spector Spector August 2002 Sinclair Miscellaneous
  • Replacement chipsAfter much digging around on here, it seems to be the general consensus that the ULA could be causing the problems im having (spectrum is deaf to the…

    ... where i could get a replacement ULA chip please? :)

    johnneh johnneh August 2004 Sinclair Miscellaneous
  • Replacement for ZTX213 I`ve had a power problem with a speccy standard 48K the +5,-5,+12 volts power on the board has gone , so I need to replace the TR5,TR4 which are ZT…

    ... you have to use the ztx types?

    Thanks in ...
    Steve(spt) Steve(spt) September 2004 Sinclair Miscellaneous
<1234567…34>

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  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully<br /> but the incorporated datacorder is simply worn out and won't load<br /> ANYTHIN…
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